Dust-cap for valves of pneumatic tires.



W. P. HAMMOND.

DUST CAP FOR VALVES 0F PNEUMATIC TIRES.

APPLICATION FILED AUG.I2. 1910.

Patented May 6, 1919.

WILLIAM P. HMONJD, 01E PASSAIC, NEW JERSEY, ASSIGNOR TO A. SCI-IRAJjEMRS SON, IN'Q, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

DUST-0A]? FOR VALVES O15 PNEU'IVIATIO TIRES.

Specification of Letter Patent.

Patente ay 6, ll.

Application filed August 12, 1910. Serial No. 576,845.

To all whom it may concern:

Be it known that I, WmLIAM P. HAM- mom), a citizen of the United States, and a resident of the city and county of Passaic, State of New Jersey, have invented certain new and useful Improvements in Dust- Caps for Valves of Pneumatic Tires, of which the following, taken in connection with the accompanying sheet of drawing,

' out that the total of at least one hundred and twenty turns required before the cap is in place will consume a material amount of time. It is for this reason that not infrequently it is found that chauii'eurs and owners dispense entirely with these dust caps, notwithstanding the fact that it is desirable to use them.

My invention has for an object the production of a dust cap which can be mounted upon the valve casing instantly and without trouble, merely by slipping the same over the casing and with a sliding movement envelop the sameto the extent allowed by the rim securing nut, and then with a slight rotar movement lock the same in an effective ho ding position.

'Another object of my invention is to produce a dust and water tight joint at the meeting of the cap and the rim nut, so that it will be impossible for either water or dirt to filter through the space caused by the chamfered surface of the valve'casing, to the tire tube.

To the accomplishment of this, as Well as other objects that will manifest themselves on reading the following specification, I will proceed to describe the illustrated embodiment ofi my invention, which is a preferable means of its accomplishment, not restricting myself, however, to this described means, but reserving a fair range of equivalents which may be resorted to to eflect the object of my invention.

In the drawing, Figure 1 is a View in side elevation of a complete automobile tire valve, and the dust cap made according to my invention in vertical section. Fig. 2 is a sectional view, partly in elevation, showing a modification.

'-1- indicates the complete valve as now generally, used, and which consists of the stem portion, securing nuts and parts 2, 3; 4 and 5, an interior check valve mechanism (not shown) and a cap 6, all of which is of usual and well known construction. The valve casing is screw-threaded along its entire longitudinal length and is provided with two chambered or fiat sides 7- formed by either cutting away the threads or by threading in the of like cross section.

The dust cap is indicated at 8- and is of dome shape (and drawn to any desired first instance a tube length. In the interior peripheral surface.

of this cap are formed two longitudinal rows, diametrically opposite-each other, of grooves or screw threads -9-, the threads being of proper length to permit the same to pass freely along the flat sides -7- of ,the valve casing when the cap is mounted thereon, and still of suflicient len th to form a substantial engagement with 51c threads of the valve casing when the cap is given its partial rotary movement,

I have found in practice that it is desirable to use a resilient washer 10 between the end of the cap .8' and the rim nut -2, in order to eifect a good joinder be tween these parts, owing to the fact that the rim nut 2 may in some instanceslap to some extent the next adjacent thread above it due to the varying thicknesses of rims to w ich they are attached. The'result of this is that the threads of the cap cannot pick this thread up when rotated. By using the washer -10- it is possible, owing to its resiliency which permits of :sufiicient amount of compression that is necessary, to bring the threads on. the capinto proper alinement with the lowest thread on the casing. his washer further serves the purpose of obtaining greater stability of connection between the cap and the rim nut and casing. The washer -10- is mounted and retained within the flared end 11 of the cap, as shown, so that the washer and cap may be ordinarily inseparable and sold as a unit.

I have also found it desirable to close one end of the threads, as shown at 9'+ in the is to prevent rotation or loosening of the cap when in position." This is accomplished by sliding the rod -l2 intothe space between the flat side of the casing and the cap.

Having thus described my invention what I claim as new herein and desire to secure by Letters Patent is 1. A device of the character described including a tire valve casing having the exterior thereof provided with threads and said threads being mutilated upon one side of the valve easing, a dust cap adapted to fit over and house the tire valve casing and having the mouth thereof flared outwardly, said dust cap being provided upon the interior thereof with a threaded portion which I is adapted to slide freely over the before mentioned mutilated portion of the threads of the valve casing and to interlock with the threads of the valve casing when the dust cap is rotated, and a compressible washer member arranged within the flared moutl. of the dust cap so as to be compressed when the dust cap is seated in position and serve to hold the threads of the dust cap in a positive engagement with the threads of the valve easing.

2. A device of the character described including a tire valve easing having the exterior thereof provided with threads and said threads being mutilated on one side of the valve casing, a dust cap adapted to fit over and house the valve casing and provided upon the interior thereof with a threaded portion adapted to slip freely over the mutilated portion of the threads of the valve casing and to positively engage the threads of the valve casing when rotated, and a slide mounted upon the dust cap for engagement with the mutilated portion of the threads of the valve casing to hold the dust cap against rotation.

3. The combination with a valve casing provided with successive engaging portions, and a dust eap formed to be slipped over the valve casing to approximately the secured position of the dust cap, of resilient means adapted to be interposed between the dust cap and a relatively fixed part adjaoent the valve easing, said resilient means being capable of being compressed by the hand of the operator in slipping the dust cap in place to enable engagement of an advanced engaging portion not free for engagement when said means is expanded, and means carried by the dust cap formed to engage said engaging portions, the parts cooperating to hold the cap firmly in place in the advanced position against vibrations under all normal conditions of use.

WILLIAM P. HAMMOND. Witnesses:

P. FRANK SONNEK, M. C. HAMMOND. 

